Biology (5090) grade thresholds

Cambridge O Level — official minimum raw marks per grade.

June 2025

Overall thresholds (by syllabus option)

Option	Components	Max	A*	A	B	C	D	E
AX	11, 21, 31	200	165	139	113	88	74	61
AY	12, 22, 32	200	153	127	101	75	63	52
BX	11, 21, 41	200	163	137	111	86	73	60

Per-component thresholds

Component	Max mark	A	B	C	D	E
11	40	32	26	20	17	15
12	40	32	26	20	17	15
21	80	49	38	27	23	17
22	80	39	28	17	14	10
31	40	30	27	24	20	17
32	40	30	27	24	20	17
41	40	28	25	22	19	16
42	40	30	27	24	21	18

Source: official CAIE grade-threshold table (June 2025)

Practicing Biology (5090)?

Every Biology past-paper question with a step-by-step worked solution, and AI marking against the official mark scheme — type your answer or upload a photo of your working, and see how your raw marks stack up against these thresholds.

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Grade A* is not awarded on individual components. “–” means the grade is not available for that row (e.g. IGCSE core tier caps at grade C). Independent reference — not affiliated with CAIE.

Component	Max mark	A	B	C	D	E
11	40	32	26	20	17	15
12	40	32	26	20	17	15
21	80	49	38	27	23	17
22	80	39	28	17	14	10
31	40	30	27	24	20	17
32	40	30	27	24	20	17
41	40	28	25	22	19	16
42	40	30	27	24	21	18

Component	Max mark	A	B	C	D	E
11	40	32	26	20	17	15
12	40	32	26	20	17	15
21	80	49	38	27	23	17
22	80	39	28	17	14	10
31	40	30	27	24	20	17
32	40	30	27	24	20	17
41	40	28	25	22	19	16
42	40	30	27	24	21	18

Component	Max mark	A	B	C	D	E
11	40	32	26	20	17	15
12	40	32	26	20	17	15
21	80	49	38	27	23	17
22	80	39	28	17	14	10
31	40	30	27	24	20	17
32	40	30	27	24	20	17
41	40	28	25	22	19	16
42	40	30	27	24	21	18